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MPPL Series - Guided Linear Motion Magnetically Coupled Positioners

Magnetically-coupled Push Pull devices providing linear guided motion solutions for low load applications in high vacuum and ultra-high vacuum provided on CF16 flange as standard with strokes from 50mm to 300mm. Manual, pneumatic and motorized actuation options with additional switches to prevent over-travel and aid system interlocks are available.


  • Internally-guided linear motion
  • Guaranteed rotation-free motion
  • No bellows - smooth operation
  • No thrust due to vacuum
  • Over 90 N (20 lbf) linear thrust
  • Entire unit bakeable to 250°C

Standard In-line pneumatically actuated MPPL

Special side-mounted pneumatically actuated MPPL

The MPPL provides internally-guided linear motion of the vacuum shaft, guaranteeing rotation-free motion. Furthermore, the high axial thrust coupling produces no torque and so external rotation of the thimble does not apply a rotational force internally, ensuring smooth motion.

The range can be actuated manually, pneumatically or motorized with DC or stepper motors. Additionally, switches can be provided to prevent over-travel and to aid system interlocks.

The MPPL provides a simple and intrinsically safe alternative to bellows push pull systems. Utilising UHV Design's magnetic coupling technology the Magnetic Push Pull removes the need for edge-welded bellows stacks, incorporated within traditional push pull designs. Their elimination maximizes vacuum integrity, providing a robust, cost-effective solution. Also, unlike a bellows-sealed device, the MPPL is not subject to the thrust due to vacuum, resulting in smooth, free-moving operation.

The CF16 flange versions of the MPPL are typically available from stock. CF35 flange versions are available at additional cost.

Dimensional Drawings

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Manipulation and Motion FAQ
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